The risk of bleeding from alimentary tract obtains the most frequently the upper part. The diseases predisposing are: ulceration of duodenum and stomach, erosions and other inflammatory lesions, than in succession oesophageal varices, erosions including Mallory-Weiss syndrome, stomach and oesophageal neoplasms. The bleedings from lower alimentary tract are about five times rare and caused by colonic diverticulosis, progress of colitis ulcerosa, Crohn syndrome, inflammatory processes after radiation and drugs using, cancers and polyps. In the recent analysis it is clearly showed that inflammatory changes are most frequent than neoplasms in risk of bleeding in alimentary tract diseases.